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This is needed for #417.
Unselected radio field results in the value of the field being 'None' not None. This is fixed in newer versions. In newer versions, a few imports have changed and email_validators needs to be added a dependency separately to use EmailField.
Newer version of WTForms do not cache form.errors so each call to errors returns a new dict. Form level validation should instead be performed by appending errors to form.form_errors as shown in this commit. pallets-eco/wtforms@22636b5